Required Port 443 For Veeam Backup & Replication Is Occupied By Another Application May 2026

Though rare, attempting to run vCenter Server on the same Windows machine as Veeam will cause a port conflict because vCenter’s web client also uses 443.

Various unified communications components reserve port 443 for media and signaling. Though rare, attempting to run vCenter Server on

Scenario 1 — IIS default website bound to 443 blocking Veeam Scenario 2 — HTTP

Scenario 2 — HTTP.sys reservation by a management agent (no visible service) Though rare, attempting to run vCenter Server on

Get-NetTCPConnection -LocalPort 443 | Select-Object -Property LocalAddress, LocalPort, State, OwningProcess
Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess

Developer tools or web servers left running from previous projects.